Merge branch 'audiomsg_overhaul' (nonshared eventlists and more)

This introduces the following changes:
 - Clone Parts no more share their eventlist. Instead, all changes
   made to one clone are replicated to the other clones' eventlists
 - audio/song->msg{Add,Delete,Change}{Part,Event,Track} have been
   replaced by the corresponding UndoOp operations.
 - Enforcing of const-correctness: No GUI code may ever gain
   writable access to audio/midi/song data structures. Access
   must *always* go through applyOperationGroup. This is now
   enforced.
 - Removed a bunch of DELETETHIS or REMOVE or otherwise commented
   out code
 - Removed dead code
 - Removed unused Audio Messages (that should go through applyOpGroup
   anyway.)

1 files changed, 4 insertions, 2 deletions

diff --git a/muse2/muse/waveevent.h b/muse2/muse/waveevent.h
index e814fe3d..d11803c7 100644
--- a/muse2/muse/waveevent.h
+++ b/muse2/muse/waveevent.h
@@ -44,15 +44,17 @@ class WaveEventBase : public EventBase {
       int _spos;            // start sample position in WaveFile
       bool deleted;
 
-      virtual EventBase* clone();
+      virtual EventBase* clone() const;
 
    public:
       WaveEventBase(EventType t);
       virtual ~WaveEventBase() {}
+      
+      virtual bool isSimilarTo(const EventBase& other) const;
 
       virtual void read(Xml&);
       virtual void write(int, Xml&, const Pos& offset, bool forcePath = false) const;
-      virtual EventBase* mid(unsigned, unsigned);
+      virtual EventBase* mid(unsigned, unsigned) const;
       
       virtual void dump(int n = 0) const;